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fomenos
3 years ago
10

What is the percent composition by mass of oxygen in

Chemistry
1 answer:
KiRa [710]3 years ago
4 0

What is the percent composition by mass of oxygen in magnesium oxide, MgO?

Answer: 39.7 percent

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9.63 Km is the equivalent to 9,630 m. <br><br>True. or False​
Karo-lina-s [1.5K]

Answer:

9.63 Km is the equivalent to 9,630 m.

9.63 Km is the equivalent to 9,630 m. TRUE

7 0
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Which statement best describes how energy is important to chemistry?
nordsb [41]

Answer:

C. Energy is absorbed and released during chemical reactions,

Explanation:

All chemical reactions involve energy. Energy is used to break bonds in reactants, and energy is released when new bonds form in products. Endothermic reactions absorb energy, and exothermic reactions release energy.

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3 years ago
What is the formula for lead(ii) phosphate?
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Explanation:

Lead(II) phosphate is an ionic compound with chemical formula Pb3(PO4)2. Lead(II) phosphate is a long-lived electronically neutral reagent chemical.[1] Despite limited tests on humans, it has been identified as a carcinogen based on tests on animals conducted by the EPA.[2] Lead(II) phosphate appears as hexagonal, colorless crystals or as a white powder. Lead(II) phosphate is insoluble in water and alcohol but soluble in Nitric acid (HNO3) and has fixed alkali hydroxides. When lead(II) phosphate is heated for decomposition it emits very toxic fumes containing Lead (Pb) and POx.[3]

6 0
2 years ago
According to Newton's first law of physics, what will a bowling ball do as it rolls down the bowling alley?
Nitella [24]

Answer:

Because there is no friction, Newton's first law states that the ball should continue to roll. (continue at a constant speed)

Explanation:

Unless acted upon by an unbalanced force, Newton's first law of motion states that an object at rest stays at rest and an object in motion stays in motion with the same speed and direction.

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